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Optical Layout Cavity Lengths

Optical Layout Cavity Lengths. Input Mode Cleaner (IMC) IMC FSR = ~9 MHz Length = ~16.6 m = ~HAM1 to HAM3 separation Power Recycling Cavity (PRC) PRC FSR = 2 x IMC FSR = ~18 MHz Length = ~8.3 m = ~HAM3 to BSC2 separation Asymmetry = 0.2 m Signal Recycling Cavity (SRC) f = 180 MHz

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Optical Layout Cavity Lengths

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  1. Optical LayoutCavity Lengths • Input Mode Cleaner (IMC) • IMC FSR = ~9 MHz • Length = ~16.6 m = ~HAM1 to HAM3 separation • Power Recycling Cavity (PRC) • PRC FSR = 2 x IMC FSR = ~18 MHz • Length = ~8.3 m = ~HAM3 to BSC2 separation • Asymmetry = 0.2 m • Signal Recycling Cavity (SRC) • f = 180 MHz • Length = ~8.4 m = ~HAM4 to BSC2 separation • Fabry-Perot (FP) Arm Cavities • Length = ~4 km • Precise frequencies and lengths in the optical layout document • T010076-01 • Folded interferometer layout pending ADVANCED LIGO

  2. Optical LayoutPlan View ADVANCED LIGO

  3. Optical LayoutRecycling Cavities ADVANCED LIGO

  4. Headroom in HAM Chamberconstrains MC, RM placement • Available area dimensions as a function of table & suspension heights are defined in T000087-01 ADVANCED LIGO

  5. Optical LayoutWedge Options ADVANCED LIGO

  6. Optical LayoutElevation View ADVANCED LIGO

  7. Optical LayoutGhost Beams ADVANCED LIGO

  8. Optical LayoutCriteria • Requires BS wedge angle > currently defined manufacturing limit ADVANCED LIGO

  9. Optical LayoutIssues, Limitations • Folded interferometer layout pending • Active thermal compensation system? • May require the addition of 1 or 2 phase plates in the PRC • May benefit from putting the AR side of the PRM into the PRC for common mode corrector • Single recycling cavity pick-off beam? • 3 in initial LIGO: ITMx, ITMy, BS • May require only one in advanced LIGO • Non-wedged ITMs? • Horizontal Wedges? • May be possible if a single RC pick-off is sufficient • May require (somewhat) larger SEI BSC tables • In fact, recommend going to maximum size square BSC SEI tables (limited by support tubes) • Suspension planform dimensions? • Layout is tight, need an estimate of SUS quad & triple base size to resolve ADVANCED LIGO

  10. Active Thermal CompensationPotential Implementation ADVANCED LIGO

  11. Suspension Table Area? • Suspension • Quadruple prototype (shown at left) • Apparent planform dimensions: 700 X 1020 (lateral) mm • >> than assumed 330 X 420 (lateral) mm in layout ADVANCED LIGO

  12. Generic Requirements & Standards for Subsystems • Collection of (or pointers to) the general requirements and standards which apply to all (or most) subsystems • Design standards • Review requirements • Documentation requirements • Configuration controls • Test requirements • EMC requirements • Vacuum compatible materials, processing • Etc. ADVANCED LIGO

  13. Generic Requirements & Standards for Subsystems Table of Contents 1Introduction 1.1Purpose 1.2Scope 1.3Definitions 1.4Acronyms 1.5Applicable Documents 1.5.1LIGO Documents 1.5.2Non-LIGO Documents 2Review Requirements 2.1Design Reviews 2.2Approval & Release Process 3Configuration Control 3.1Design Configuration Control 3.2Interfaces Definition & Control 3.3Physical Configuration Control 4Documentation Requirements 4.1Documentation Numbering & Electronic Filing 4.2Design, Analysis & Test 4.2.1Design Requirements Document (DRD) 4.2.2Conceptual Design Document (CDD) 4.2.3Preliminary Design Document (PDD) 4.2.4Final Design Document (FDD) 4.2.5Technical Design Memorandum 4.2.6Test Plans and Procedures 4.2.7Prototype Test Plans & Results 4.3Fabrication and Process Specifications 4.4Engineering Drawings and Associated Lists 4.5Technical Manuals and Procedures 4.5.1Procedures 4.5.2Manuals 5Testing Requirements 5.1Form & Fit 5.2Assembly 5.3Function 5.4Performance 5.5Self-Test 5.6Installation 6Mechanical Characteristics & Standards 6.1Materials and Processes 6.2Welding and Brazing 6.3Bolted Joints & Threaded Fasteners 6.4Drawing Standards 6.5CAD Standards 6.6Interchangeability 6.7Workmanship 6.8Human Engineering 6.9Preparation for Delivery 6.9.1Preparation 6.9.2Packaging 6.9.3Marking ADVANCED LIGO

  14. Generic Requirements & Standards for Subsystems 6.10Assembly 6.11Installation 7Electrical Characteristics & Standards 7.1Grounding & Shielding 7.2EMI 7.3Cabling 7.4Connectors 7.5Bus Architecture 7.5.1EPICS control interface 7.5.2Workmanship 7.5.3Software Characteristics & Standards 7.6TBD 7.7GUI Human Engineering 8Vacuum Compatibility Requirements 8.1Form/Fit 8.2Tribology 8.3Materials 8.4Qualification 8.5Fabrication 8.6Cleaning 9Earthquake Requirements 9.1Structural Integrity 9.2Alignment 9.3Operation 10Quality Assurance 10.1Quality conformance inspections 10.1.1Inspections 10.1.2Analysis 10.1.3Demonstration 10.1.4Similarity 10.1.5Test 10.2Quality Confiormance Matrix 11Reliability 11.1Reliability Requirements 11.2Reliability Testing 12Maintainability 13Transportability 14Safety ADVANCED LIGO

  15. Generic Requirements & Standards for Subsystems • Basically the same as initial LIGO • Fill omissions, provide clarifications to initial LIGO requirements • Added requirements: • CAD Standards: SolidWorks & 3D preferred • AutoCad & 2D may be deemed acceptable on a case by case basis • Earthquake limit for seismic & suspension survival & alignment retention • For controlled documents: Source file archival required (in addition to Adobe AcroBat format) • All piece parts must be marked with part # (= drawing # - revision S/N) • Status of LIGO-E010123: • Outline completed • Content growing • Comments & suggestions welcome ADVANCED LIGO

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